FtpDLX - Subsesquent ListDir Commands (General questions)

This works:

m_RemotePath = "/users/0098";
m_FtpDlx.ListDir(string.Format("{0}/{1}", m_ReportPath, "edit/"));

But this doesn't:

m_RemotePath = "/users/0098";
m_FtpDlx.RemotePath = m_RemotePath;
m_FtpDlx.ListDir("edit/");

What's the difference? The only difference I see is that a command was not yet issued when the remote path was set. Does an underlying internal property get set when it was issued through an actual command? Is there anyway to force it?